经济不平等不仅是一个道德问题，也是一个经济问题。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
The best performance improvement is the transition from the nonworking state to the working state.
生活是荒谬的。
The world is a beautiful place, but it has its thorns.
No man is useless in this world who lightens the burden of someone else.